"I just wanted to report, that somewhere in the last 48 hours, Reddit appears to have partially broken on all XP browsers, including New Moon, MayPal and Chromium ports. It seems several smaller functions don't work anymore, but the most prominent thing is that new posts don't get dynamically shown when scrolling down anymore. The amount of posts the user can see seems to depend on the viewport, or rather on the vertical resolution."
Did you try switching the url to old.reddit.com ?
For instance, instead of https://www.reddit.com/r/windowsxp ....use: https://old.reddit.com/r/windowsxp